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LibWeb: Add new code generator for creating exposed interface helpers
This new code generator takes all the .idl files in LibWeb, looks for each top level interface in there with an [Exposed=Foo] attribute, and adds code to add the constructor and prototype for each of those exposed interfaces to the realm of the relevant global object we're initialzing. It will soon replace WindowObjectHelper as the way that web interfaces are added to the Window object, and will be used in the future for creating proper WorkerGlobalScope objects for dedicated and shared workers.
This commit is contained in:
Andrew Kaster
Andreas Kling
parent
067a53b7e7
commit
2acff8d853
3 changed files with 340 additions and 0 deletions
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/*
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* Copyright (c) 2022, Andrew Kaster <akaster@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Debug.h>
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#include <AK/LexicalPath.h>
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#include <AK/SourceGenerator.h>
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#include <AK/String.h>
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#include <AK/StringBuilder.h>
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#include <LibCore/ArgsParser.h>
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#include <LibCore/Stream.h>
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#include <LibIDL/IDLParser.h>
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#include <LibIDL/Types.h>
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#include <LibMain/Main.h>
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static ErrorOr<void> add_to_interface_sets(IDL::Interface&, Vector<IDL::Interface&>& window_exposed, Vector<IDL::Interface&>& dedicated_worker_exposed, Vector<IDL::Interface&>& shared_worker_exposed);
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static String s_error_string;
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static ErrorOr<void> generate_exposed_interface_header(StringView class_name, StringView output_path)
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{
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StringBuilder builder;
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SourceGenerator generator(builder);
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generator.set("global_object_snake_name", String(class_name).to_snakecase());
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generator.append(R"~~~(
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#pragma once
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#include <LibJS/Forward.h>
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namespace Web::Bindings {
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void add_@global_object_snake_name@_exposed_interfaces(JS::Object&, JS::Realm&);
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}
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)~~~");
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auto generated_header_path = LexicalPath(output_path).append(String::formatted("{}ExposedInterfaces.h", class_name)).string();
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auto generated_header_file = TRY(Core::Stream::File::open(generated_header_path, Core::Stream::OpenMode::Write));
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TRY(generated_header_file->write(generator.as_string_view().bytes()));
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return {};
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}
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static ErrorOr<void> generate_exposed_interface_implementation(StringView class_name, StringView output_path, Vector<IDL::Interface&>& exposed_interfaces)
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{
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StringBuilder builder;
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SourceGenerator generator(builder);
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generator.set("global_object_name", class_name);
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generator.set("global_object_snake_name", String(class_name).to_snakecase());
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generator.append(R"~~~(
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#include <LibJS/Runtime/Object.h>
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#include <LibWeb/Bindings/Intrinsics.h>
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#include <LibWeb/Bindings/@global_object_name@ExposedInterfaces.h>
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)~~~");
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for (auto& interface : exposed_interfaces) {
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auto gen = generator.fork();
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gen.set("prototype_class", interface.prototype_class);
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gen.set("constructor_class", interface.constructor_class);
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gen.append(R"~~~(#include <LibWeb/Bindings/@constructor_class@.h>
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)~~~");
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if (interface.parent_name != "[Synthetic Interface]"sv)
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gen.append(R"~~~(#include <LibWeb/Bindings/@prototype_class@.h>
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)~~~");
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}
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// FIXME: Special case window. We should convert Window, Location, and Navigator to use IDL
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if (class_name == "Window"sv) {
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generator.append(R"~~~(#include <LibWeb/Bindings/WindowConstructor.h>
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#include <LibWeb/Bindings/WindowPrototype.h>
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#include <LibWeb/Bindings/LocationConstructor.h>
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#include <LibWeb/Bindings/LocationPrototype.h>
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#include <LibWeb/Bindings/NavigatorConstructor.h>
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#include <LibWeb/Bindings/NavigatorPrototype.h>
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)~~~");
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}
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generator.append(R"~~~(
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namespace Web::Bindings {
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void add_@global_object_snake_name@_exposed_interfaces(JS::Object& global, JS::Realm& realm)
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{
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auto& vm = global.vm();
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// FIXME: Should we use vm.current_realm() here?
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)~~~");
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auto add_interface = [](SourceGenerator& gen, StringView name, StringView prototype_class, StringView constructor_class) {
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gen.set("interface_name", name);
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gen.set("prototype_class", prototype_class);
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gen.set("constructor_class", constructor_class);
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gen.append(R"~~~( {
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auto& prototype = Bindings::ensure_web_prototype<Bindings::@prototype_class@>(realm, "@interface_name@");
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auto& constructor = Bindings::ensure_web_constructor<Bindings::@constructor_class@>(realm, "@interface_name@");
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global.define_direct_property("@interface_name@", &constructor, JS::Attribute::Writable | JS::Attribute::Configurable);
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prototype.define_direct_property(vm.names.constructor, &constructor, JS::Attribute::Writable | JS::Attribute::Configurable);
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constructor.define_direct_property(vm.names.name, js_string(vm, "@interface_name@"), JS::Attribute::Configurable);
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}
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)~~~"); };
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for (auto& interface : exposed_interfaces) {
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auto gen = generator.fork();
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add_interface(gen, interface.name, interface.prototype_class, interface.constructor_class);
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}
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// FIXME: Special case window. We should convert Window, Location, and Navigator to use IDL
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if (class_name == "Window"sv) {
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auto gen = generator.fork();
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add_interface(gen, "Window"sv, "WindowPrototype"sv, "WindowConstructor"sv);
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add_interface(gen, "Location"sv, "LocationPrototype"sv, "LocationConstructor"sv);
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add_interface(gen, "Navigator"sv, "NavigatorPrototype"sv, "NavigatorConstructor"sv);
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}
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generator.append(R"~~~(
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}
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}
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)~~~");
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auto generated_implementation_path = LexicalPath(output_path).append(String::formatted("{}ExposedInterfaces.cpp", class_name)).string();
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auto generated_implementation_file = TRY(Core::Stream::File::open(generated_implementation_path, Core::Stream::OpenMode::Write));
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TRY(generated_implementation_file->write(generator.as_string_view().bytes()));
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return {};
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}
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ErrorOr<int> serenity_main(Main::Arguments arguments)
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{
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Core::ArgsParser args_parser;
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StringView output_path;
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StringView base_path;
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Vector<String> paths;
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args_parser.add_option(output_path, "Path to output generated files into", "output-path", 'o', "output-path");
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args_parser.add_option(base_path, "Path to root of IDL file tree", "base-path", 'b', "base-path");
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args_parser.add_positional_argument(paths, "Paths of every IDL file that could be Exposed", "paths");
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args_parser.parse(arguments);
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VERIFY(!paths.is_empty());
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VERIFY(!base_path.is_empty());
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const LexicalPath lexical_base(base_path);
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// Read in all IDL files, we must own the storage for all of these for the lifetime of the program
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Vector<String> file_contents;
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for (String const& path : paths) {
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auto file_or_error = Core::Stream::File::open(path, Core::Stream::OpenMode::Read);
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if (file_or_error.is_error()) {
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s_error_string = String::formatted("Unable to open file {}", path);
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return Error::from_string_view(s_error_string);
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}
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auto file = file_or_error.release_value();
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auto string = MUST(file->read_all());
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file_contents.append(String(ReadonlyBytes(string)));
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}
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VERIFY(paths.size() == file_contents.size());
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Vector<IDL::Parser> parsers;
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Vector<IDL::Interface&> window_exposed;
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Vector<IDL::Interface&> dedicated_worker_exposed;
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Vector<IDL::Interface&> shared_worker_exposed;
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// TODO: service_worker_exposed
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for (size_t i = 0; i < paths.size(); ++i) {
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IDL::Parser parser(paths[i], file_contents[i], lexical_base.string());
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TRY(add_to_interface_sets(parser.parse(), window_exposed, dedicated_worker_exposed, shared_worker_exposed));
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parsers.append(move(parser));
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}
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TRY(generate_exposed_interface_header("Window"sv, output_path));
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TRY(generate_exposed_interface_header("DedicatedWorker"sv, output_path));
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TRY(generate_exposed_interface_header("SharedWorker"sv, output_path));
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// TODO: ServiceWorkerExposed.h
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TRY(generate_exposed_interface_implementation("Window"sv, output_path, window_exposed));
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TRY(generate_exposed_interface_implementation("DedicatedWorker"sv, output_path, dedicated_worker_exposed));
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TRY(generate_exposed_interface_implementation("SharedWorker"sv, output_path, shared_worker_exposed));
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// TODO: ServiceWorkerExposed.cpp
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return 0;
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}
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static void consume_whitespace(GenericLexer& lexer)
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{
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bool consumed = true;
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while (consumed) {
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consumed = lexer.consume_while(is_ascii_space).length() > 0;
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if (lexer.consume_specific("//")) {
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lexer.consume_until('\n');
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lexer.ignore();
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consumed = true;
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}
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}
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}
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enum ExposedTo {
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Nobody = 0x0,
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DedicatedWorker = 0x1,
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SharedWorker = 0x2,
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ServiceWorker = 0x4,
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AudioWorklet = 0x8,
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Window = 0x10,
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AllWorkers = 0xF, // FIXME: Is "AudioWorklet" a Worker? We'll assume it is for now
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All = 0x1F,
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};
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AK_ENUM_BITWISE_OPERATORS(ExposedTo);
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static ErrorOr<ExposedTo> parse_exposure_set(IDL::Interface& interface)
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{
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// NOTE: This roughly follows the definitions of https://webidl.spec.whatwg.org/#Exposed
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// It does not remotely interpret all the abstract operations therein though.
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auto maybe_exposed = interface.extended_attributes.get("Exposed");
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if (!maybe_exposed.has_value()) {
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s_error_string = String::formatted("Interface {} is missing extended attribute Exposed", interface.name);
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return Error::from_string_view(s_error_string);
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}
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auto exposed = maybe_exposed.value().trim_whitespace();
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if (exposed == "*"sv)
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return ExposedTo::All;
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if (exposed == "Window"sv)
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return ExposedTo::Window;
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if (exposed == "Worker"sv)
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return ExposedTo::AllWorkers;
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if (exposed == "AudioWorklet"sv)
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return ExposedTo::AudioWorklet;
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if (exposed[0] == '(') {
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ExposedTo whom = Nobody;
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for (StringView candidate : exposed.substring_view(1, exposed.length() - 1).split_view(',')) {
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candidate = candidate.trim_whitespace();
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if (candidate == "Window"sv) {
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whom |= ExposedTo::Window;
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} else if (candidate == "Worker"sv) {
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whom |= ExposedTo::AllWorkers;
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} else if (candidate == "DedicatedWorker"sv) {
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whom |= ExposedTo::DedicatedWorker;
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} else if (candidate == "SharedWorker"sv) {
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whom |= ExposedTo::SharedWorker;
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} else if (candidate == "ServiceWorker"sv) {
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whom |= ExposedTo::ServiceWorker;
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} else if (candidate == "AudioWorklet"sv) {
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whom |= ExposedTo::AudioWorklet;
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} else {
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s_error_string = String::formatted("Unknown Exposed attribute candidate {} in {} in {}", candidate, exposed, interface.name);
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return Error::from_string_view(s_error_string);
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}
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}
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if (whom == ExposedTo::Nobody) {
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s_error_string = String::formatted("Unknown Exposed attribute {} in {}", exposed, interface.name);
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return Error::from_string_view(s_error_string);
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}
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return whom;
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}
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s_error_string = String::formatted("Unknown Exposed attribute {} in {}", exposed, interface.name);
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return Error::from_string_view(s_error_string);
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}
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static IDL::Interface& add_synthetic_interface(IDL::Interface& reference_interface)
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{
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static Vector<NonnullOwnPtr<IDL::Interface>> s_synthetic_interfaces;
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GenericLexer function_lexer(reference_interface.extended_attributes.get("LegacyFactoryFunction").value());
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consume_whitespace(function_lexer);
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auto name = function_lexer.consume_until([](auto ch) { return is_ascii_space(ch) || ch == '('; });
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auto new_interface = make<IDL::Interface>();
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new_interface->name = name;
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new_interface->constructor_class = String::formatted("{}Constructor", new_interface->name);
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new_interface->prototype_class = reference_interface.prototype_class;
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new_interface->parent_name = "[Synthetic Interface]";
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s_synthetic_interfaces.append(move(new_interface));
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return *s_synthetic_interfaces.last();
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}
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ErrorOr<void> add_to_interface_sets(IDL::Interface& interface, Vector<IDL::Interface&>& window_exposed, Vector<IDL::Interface&>& dedicated_worker_exposed, Vector<IDL::Interface&>& shared_worker_exposed)
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{
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// TODO: Add service worker exposed and audio worklet exposed
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auto whom = TRY(parse_exposure_set(interface));
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VERIFY(whom != ExposedTo::Nobody);
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if (whom & ExposedTo::Window)
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window_exposed.append(interface);
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if (whom & ExposedTo::DedicatedWorker)
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dedicated_worker_exposed.append(interface);
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if (whom & ExposedTo::SharedWorker)
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shared_worker_exposed.append(interface);
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if (interface.extended_attributes.contains("LegacyFactoryFunction")) {
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auto& synthetic_interface = add_synthetic_interface(interface);
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if (whom & ExposedTo::Window)
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window_exposed.append(synthetic_interface);
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if (whom & ExposedTo::DedicatedWorker)
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dedicated_worker_exposed.append(synthetic_interface);
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if (whom & ExposedTo::SharedWorker)
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shared_worker_exposed.append(synthetic_interface);
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}
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return {};
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}
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